Deliciae Physico-mathematicae oder Mathematische und Philosophische Erquickstunden

Deliciae Physico-mathematicae oder Mathematische und Philosophische Erquickstunden was a popular collection of recreational problems compiled by Daniel Schwenter, a German professor. Published posthumously in 1636, it was based largely on a translation of Jean Leurechon's Récréations mathématiques and included many of Schwenter's own collected problems.1

The work covered a wide range of topics, including arithmetic, geometry, mechanics, and natural philosophy, and was immensely popular, with supplementary editions published in 1651–53. For a time, Schwenter's enlarged edition was considered the most comprehensive treatise of its kind. Such collections of mathematical puzzles and games, often referred to as number games, have a long history and appeal to a wide audience.12